Since we are on the topic. Years ago the "new" idea was a second subwoofer. This went on for a few quite a few years and then it changed to what you really need is 4 subwoofers. So, I have seen a newbie asking questions on other sites and the answer is basically you need 4 subwoofers (on other sites) to really have good sound. The problem is that most of the posters probably only have one sub!
Multiple subs are used to break up standing waves that can cause bass to be everywhere but the listening chair. With a single sub you really do have to place it properly in order for it to be heard at the listening position. Sometimes you can get away with it random luck; consider that at 80Hz the waveform is 14 feet long so it you can hear the one sub and its not in a really inconvenient position you're doing well.
Multiple subs are usually placed asymmetrically but they can, as a result, be a little bit more out of the way. I've really come to the conclusion that this is the way to go to get the bass right, and then you really don't need a massive speaker for the mains for the system to be quite convincing.
BTW Dr Floyd Toole of Harmon came up with this concept- it was unknown to audiophiles until Audiokinesis made a product called the Swarm that was intended for this purpose (Audiokinesis took the idea a step further by designing his subs to take advantage of Room Boundary Effect, allowing them to be smaller and placed directly against a wall). Even then its taken Duke (of Audiokinesis) 20 years to get traction with this idea. FWIW his subs are reasonably priced...
As a manufacturer I know one reason audio can be really expensive and that is if the product isn't mass produced and also if not made in China. In this country you have to pay a lot of overhead- getting good help is a problem unless you pay them and you pay 1/3rd more or so to the state for unemployment insurance; unless you are buying at 3rd column pricing things just work out expensive. Despite that the Veblen Effect is very real; people have asked me many times over the last 40 years what constitutes 'high end' audio so I've had a lot of time to think about it. My conclusion is high end audio is not driven by price, its driven by intention. If you know that you really can get great results for not a lot of money; for me Topping DACs are a good example of how that works.
This is not just an issue in audio BTW. If you are into bicycles you've probably heard of Campagnolo or Shimano; these companies price according to what the market will bear rather than to a formula. Back in the 1970s a little Japanese company called Sun Tour came up with a new derailluer idea that was vastly superior to anything Campagnolo made, but because it was priced to a formula it was mostly showing up on cheaper bicycle boom bikes of the time and never had the reputation of either of the other companies. But a guy named Frank Bertio built a machine so he could measure the shifting time and the amount of overshoot needed to reach the next gear, and showed how superior the Sun Tour product really was. Sound familiar?? It better....